304 Stainless Steel Five Link Casement Window Hinges Heavy Duty 20 Inch 22 Slot

20-Inch, 22-Slot, 304 Stainless Steel Five-Link Heavy-Duty Hinge
This model is a five-link load-bearing hinge specifically designed for extra-large, heavy-duty casement windows. It is precision-crafted from 304 stainless steel sheet metal, with a 20-inch extended arm that fits standard 22mm door and window profile slots. The five-link linkage structure provides greater load-bearing capacity and superior operational stability compared to conventional four-link designs, along with excellent corrosion and rust resistance, making it a high-end load-bearing support hardware component for oversized thermal break aluminum floor-to-ceiling windows and heavy-duty outward-opening windows.

Precision-Engineered 304 Stainless Steel Base Material with Superior Heavy-Duty Corrosion Resistance
The entire hinge is stamped from a single piece of SUS304 stainless steel sheet, ensuring robust structural rigidity and powerful load-bearing capacity. It can stably support heavy window sashes of extra-large dimensions and significant self-weight. It withstands the sash’s self-weight and strong wind loads over the long term without bending or deforming, demonstrating outstanding wind and pressure resistance. 304 stainless steel inherently possesses excellent corrosion and rust resistance. Verified through a 500-hour salt spray test, it ensures long-lasting performance in harsh environments such as coastal areas with high humidity, outdoor exposure to sun and rain, and damp conditions in kitchens and bathrooms, without issues like rust, jamming, oxidation, or wear.
All hinge points are precision-riveted using solid rivets, ensuring a tight fit between the arms with no play, resulting in smooth, low-noise operation. The product complies with the QB/T 5338-2018 General Technical Standard for Door and Window Hardware and has passed a 100,000-cycle durability test for repeated opening and closing. It maintains stable performance during frequent, year-round operation and offers a long, reliable service life.

Five-bar linkage transmission structure ensures smooth operation and more stable support
The five-bar linkage transmission structure—which adds an extra support bar compared to traditional four-bar designs—distributes forces more evenly during window sash operation. This results in a smoother, more stable operating trajectory, eliminating jamming, wobbling, or shaking, and providing a smoother feel when opening and closing. The 20-inch (approx. 508 mm) extra-long arm design enables a wider opening angle for superior ventilation. Once opened, the overall structure forms multiple layers of stable mechanical support, firmly locking the sash at the desired angle to withstand strong winds and prevent the sash from swaying and colliding with the window frame. It also limits the maximum opening angle, balancing ventilation efficiency with home safety.
The slider ends are equipped with wear-resistant guide and stop components, ensuring uniform sliding resistance and a smooth, effortless operation. The end stops are reliable and precise, effectively enhancing the smoothness of opening and closing extra-large window sashes and improving the daily user experience.

Standard groove dimensions ensure easy installation and strong compatibility
Compatible with 22mm-wide standard door and window profile grooves, this is a universal specification for oversized thermal-break aluminum casement windows, heavy-duty exterior casement windows, and top-hung windows. The base features industry-standard mounting holes for precise alignment, allowing for quick assembly using standard screws. No additional cutting or grooving of the profiles is required, making batch assembly at door and window factories efficient and time-saving, while also facilitating convenient replacement during home renovation and after-sales maintenance.

Wide Range of Applications
Widely compatible with oversized outward-opening windows, heavy-duty thermal-break aluminum floor-to-ceiling windows, large-format balcony casement windows, and heavy-duty top-hung windows for sunrooms; suitable for high-end hardware applications in residential large windows, luxury finishing projects for real estate developments, load-bearing performance upgrades for older windows and doors, as well as bulk export supply of window and door hardware.